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Yawning is thought to cool the brain and make it more alert. Simultaneous yawning may occur when a group of people are all breathing the same warm, stale air. Or contagious yawning may have evolved to help groups remain vigilant against danger.

Yawn - Wikipedia

en.wikipedia.org/wiki/Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the ... This "contagious" yawning has also been observed in chimpanzees, dogs, birds, and reptiles...

Why Are Yawns Contagious? | Mental Floss

mentalfloss.com/article/64654/why-are-yawns-contagious

Jun 11, 2015 ... What is yawning? And why do we do so much of it? Neuroscientist and yawn expert Robert Provine says it's “ancient and autonomic.” It stems ...

Why Is Yawning So Contagious? | Psychology Today

www.psychologytoday.com/blog/the-athletes-way/201403/why-is-yawning-so-contagious

Mar 16, 2014 ... About half of adults yawn after someone else yawns due to a universal phenomenon called “contagious yawning.” Researchers at Duke ...

Why Is Yawning Contagious? | Psychology Today

www.psychologytoday.com/blog/neurologic/201601/why-is-yawning-contagious

Jan 11, 2016 ... Contagious yawning isn't a myth. It's a real, scientifically demonstrable phenomenon. We yawn when we see someone else yawn. The sound ...

Does contagious yawning mean you're nice? | HowStuffWorks

science.howstuffworks.com/life/contagious-yawn.htm

Contagious yawning is associated with the same parts of the brain that deal with empathy, according to a recent study. Learn about contagious yawning.

Why Do We Yawn and Why Is It Contagious? | Science | Smithsonian

www.smithsonianmag.com/science-nature/why-do-we-yawn-and-why-is-it-contagious-3749674/

Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research suggests that our sleepy sighs help to regulate the temperature of our ...

Is yawning contagious? If so, why? What's the evidence? - Quora

www.quora.com/Is-yawning-contagious-If-so-why-Whats-the-evidence

Update (Jan 2016): I wrote this answer several years ago. Though it currently has accumulated ... Do you all have any theories as to why yawning is contagious? Is yawning contagious for blind people? Is yawning healthy? Jonathan Gouveia ...

Is that person a psychopath? A yawn might help you tell - TODAY.com

www.today.com/health/person-psychopath-yawn-might-help-you-tell-t40276

Jul 8, 2016 ... People high in psychopathic personality traits often don't "catch" the contagious yawn, a new study finds.

BBC NEWS | UK | Magazine | Why is yawning contagious?

news.bbc.co.uk/2/hi/uk_news/magazine/6270036.stm

Jul 5, 2007 ... Rather than being a precursor to sleep, yawning is designed to keep us awake, say US researchers. But why does seeing someone else yawn ...